Crystal structure, microwave dielectric properties, and far-infrared spectroscopy of a novel low-dielectric constant tremolite ceramic CaZnGe2O6

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Ceramics International Pub Date : 2024-12-15 DOI:10.1016/j.ceramint.2024.10.131

Shimeng Zhang , Zeyu He , Zhiguo Wang, Zhenggang Rao, Yunlong Hu, Chunchun Li, Longlong Shu

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Abstract

The diopside-structured CaZnGe₂O₆ ceramics were synthesized using the conventional solid-state reaction method in this study, and their crystal structure, microstructural evolution, and microwave dielectric properties were systematically investigated. The XRD and Rietveld refinement analyses confirmed that CaZnGe₂O₆ crystallizes in the monoclinic crystal system with a C2/c space group. The intrinsic microwave dielectric properties of the ceramics were evaluated using far-infrared spectroscopy. The ceramic structure exhibits high density and microstructural homogeneity after sintering at 1130 °C, resulting in exceptional microwave dielectric properties achieved at this optimal temperature (ε_r = 8.78 Q×f = 63,782 GHz, τ_f = −66.4 ppm/°C). These findings highlight the potential application of CaZnGe₂O₆ ceramics as low-permittivity materials suitable for microwave devices.

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新型低介电常数透闪石陶瓷 CaZnGe2O6 的晶体结构、微波介电性能和远红外光谱分析

本研究采用常规固态反应方法合成了二片面结构的 CaZnGe2O6 陶瓷，并对其晶体结构、微观结构演变和微波介电性能进行了系统研究。XRD 和 Rietveld 精炼分析证实 CaZnGe2O6 结晶为单斜晶系，空间群为 C2/c。利用远红外光谱评估了陶瓷的内在微波介电性能。陶瓷结构在 1130 °C 烧结后表现出高密度和微观结构均匀性，从而在这一最佳温度下实现了优异的微波介电性能（εr =8.78 Q×f = 63,782 GHz，τf = -66.4 ppm/°C）。这些发现凸显了 CaZnGe2O6 陶瓷作为适用于微波器件的低容限材料的潜在应用价值。

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产品信息

阿拉丁

GeO2

阿拉丁

ZnO

阿拉丁

CaCO3

来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.